how to use blocks in ansible

by Ansible. There is an inventory file ~/playbooks/inventory on Ansible controller which has all these three nodes added. Create a playbook ~/playbooks/blocks.yml on Ansible controller to install httpd web server and start its service. We need the tasks to be run only on CentOS based web nodes.

Create the playbook using blocks to logically group the tasks (installation and service start) so that even if we run playbook for all hosts that are in inventory, the tasks are run only on CentOS based nodes.

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---

- hosts: all

  tasks:

    - block:

        - name: install httpd

          yum: name=httpd state=present

        - name: start httpd

          service: name=httpd state=started

      when: ansible_distribution == "CentOS"